Nonviolent methods ARE best. But history shows that a people oppressed long enough with no other recourse WILL resort to violence -- it's not even "revolution" so much as it is an act of "self defense."
The onus is on the ruling class who have sought (with great success) in closing off all "legal" means of having a voice in a sham democracy in which Dems and Repubs represent the ruling class, but not us lowly plebs. They collaborate (consciously or not) by leaving the capitalist economy unquestioned.
Now, having no other options available, history shows what results. It's ugly and usually spirals out of control-- but when options are shrinking, what do they expect? This is not a threat, but the inevitable outcome when certain conditions are met. And we are approaching those conditions.
The ruling class can't part with a bit of money or even acknowledge the common good? That's hubris that they will bring on themselves-- just as the French aristocracy did in the late 18th century. This is the future we're headed for, so the ruling class ought not be surprised when the day comes.